gnome-icon-theme was added as a BuildRequires in 1.4.0-3.
The failed build seems to be against 1.4.0-2, right before a bunch of
BuildRequires were added. So I'm pretty sure this can be closed.
You made a patch against 1.5.1-1, but 1.5.1-1 already includes gnome-icon-theme
as BuildRequires.